Molding apparatus



June 3%, 1925. 1,544,216

D. J. CAMPBELL MOLDING APPARATUS ri i Filed Aug. ll, 1921 4 Sheets$heet1 w Dmmm J. @ampbell M /ZWRET y flfiorneg June 3Q, 1925. 1,544,216 D. J.CAMPBELL MOLDING APPARATUS Original Filed Aug, 11, 1921 4 Sheets-Sheet 225 Inuenmr 3'. DonmdJ. Campbekh.

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D. J. CAMPBELL MOLDING APPARATUS Original Filed Aug. 11, 1921 4Sheets-Sheet 5 June 3%, E1925. 1,544,21fi

D. J. CAMPBELL MOLDING APPARATUS Original Filed Aug. ll, 1921 4Sheets-Sheet 4 QK E H- InuenTOr DonmdJGampbeH.

Patented June 30, 1925.

UNITED STATES PATENT OFFICE.

l DONALD J. CAMPBELL, OI IUSKEGON HEIGHTS, moment.

IOLDING nrim'rus.

Application filed August 11, 1921, Serial 1T0. 491,351. Renewed April25, 1988.

To all whom it may concern:

Be it known that I, DONALD J. CAMPBELL,

- on the constructions shown in my prior ap-- plications for Patent"Serial No. 454,192, and Serial No. 454,193, both filed March 21, 1921-.In the present invention, means are provided for the forcing of sandunder the pressure of compressed air into a flask part from a sandholding hopper and evenly distributing and pressing the sand around apattern, irrespective of the particular size or shape thereof, and atthe same time allowing the sand to be forced from the lower end of thehopper when needed, yet hold the sand in the hopper at other times,while the flask part, particularly the drag is so constructed that thesand may be entered thereinto with the drag in inverted position, suchconstruction serving as a support for the sand mold within the drag whenit is turned to proper position and the pattern drawn therefrom. It is aprimary object and purpose of the invention to accomplish the abovedescribed ends, as well as many others not at this time specificallystated, in a comparatively simple yet. effective manner, whereby thequantity production of molds for casting therein is attained veryeconomically.

For an understanding of the invention and the constructions embodyingthe same, reference may be 'had to the following description, taken inconnection with the accompanying drawings, in which,

Fig. 1 is a vertical section through a sand hopper and drag constructedin accordance with myinvention and operatively associated together forfilling the drag from the hopper.

1g. 2. is a similar section showing the drag reversed in position andwith the sand mold therein.

Fig. 3 is'a plan view of the structure shown in Fig. 1 below the line3-3 thereof.

Flg. is a yertical section, similar to that shown 1n Fig. 1, showin myinvention modified and changed for t e production of the drag mold for adifferent article than that produced by the construction in Fig. 1, butworking on the same principle.

Fig. 5 is a plan view of the construction below the plane of line 55, ofFig. 4.

Flg. 6 is a vertical section similar to Fi 4, showing the inventionutilized for the fill ng of the cope part of the flask and which is tobe used with the drag portion shown in Fig. 4.

Fig. 7 is a plan view of the construction below the plane of line 77, ofFig. 6, and

Fig. 8 1s a vertical section through the completed mold showing the dragof Fig. 4 inverted and the cope of Fig. 6 placed thereon.

Like reference characters refer to like parts in the different figuresof the drawmgs.

In the construction shown in Figs. 1 and 3, the plate 1 is used tosupport the flask parts in filling the same with sand and from oppositesides thereof two ears 2 extend upwardly, each being provided with anoutwardly extending stud shaft 3 adapted to rest in an open socket 4,the same bein formed at the ends of two arms 5 forke from asupporting'member 6, the same being a part of the machine shown in myprior application for patent, Ser. No. 443,739, filed Feb. 10, 1921. Onthis plate a second circular plate 7 is secured and the pattern 8 isfixed to the upper side of plate 7. 'VTwo pins 9 are secured to andextend upwardly from frame 10 of proper shape to go around thepatternand the same is inverted in position on the plate 7, having an outwardlyextending flange 11 with openings 1'1 therethrough for the passage ofthe pins 9. The pins are transversely slotted and wedge blocks 12 asstherethrough for tightly securing the drag to the plate 7, as shown inFig. 1.

The lower side of the drag is equipped with a grating structure which,in the inverted position of the drag, as in Fig.1 and Fig. 3, comes atthe upper side of the drag. This grating consists of a larger ring 13and two inner smaller rings 14 and 15, and a plurality of radial bars16, 17 and 18, all oined together and dis osed as shown m Fig. 3, thebars 16 exten ing from the outer frame of the drag to the ring 14, bars17 from the ring 14 to ring 15, and bars 18 from the ring to a commoncenter. The drag frame and the grating are integrally cast of metal andit will be noted that the radial bars 16 may be shaped'to correspond tothe form of the pattern below so as to raise over the same and leavespace between the pattern and bars of the grating for the body of sandnecessary for the making of I the mold around the pattern.

The sand hopper 19 is a shell, preferably of conical form and havingopen upper and lower ends, the shell at its lower end being formed withan outwardly extending flange 20. To the under side of the flange 20 aframe 21 for a gratin similartto that used in the lower side of t e dragissecured by screws 22, this permitting the replacement of gratings fordifferent classes of work.- The grating used in the frame 21 is an exactcomplement of that in the drag, including rings 13, 14* and 15" andradial bars corresponding, one being indicated in dotted lines at 16'and so shaped that the bars of the grating in the frame 21 come directlyover the bars of the grating in the drag. It will be noted that the barsof the grating in the drag, in theposition thereof shown in Fig. 1 arewider attheir upper than at their lower sides, and that the reverse istrue of the grating bars in frame 21.

The sand in the hopper 19, indicated at 23, is normally held from escapefrom the hopper by the grating at the lower end thereof. When compressedair is entered into the upper-end of the hopper, as outlined in m priorapplication for patent, above note the sand isiorcedthrough the gratingbetween the bars and alsothrough the grating in the drag, completelycovering the pattern and pressing the sand to the desired and requireddensity for molds around the same. After the sand has been forcedthrough the two gratings, the plates 1 and 7 are. moved from beneath thehopper and the drag removed, as by turning the plate 1 over and loweringthe drag on any mold drawing device, the drag with its contained part ofthe mold thereupon coming into the position shown in Fig. 2. It will beevident that in such position, the grating at the lower side of the dragserves to support the mold therein, indicated at 24, and that thegrating further serves to hold the sand in place against displacementduring the operation of pouring the iron or other metal into the mold,yet with full opportunity for guano etween the bars of the grating. Noadditional bottom board is required,

Other forms of gratmgs for dliferent types of molds may be made workingon the same principle. In Fig. 4, the drag portion of the flask includesan outer frame 25 with outwardly extending flange ears 26 at oppositesides with openin therethrough for the passage of pins 9 w ich extendthrough similar ears 27 extending outwardly from the upper part of alower box-like enclosure havin sides 28 and a bottom 29, the upper sidet ereof being closed by an integral cross plate 30 through which aplurality of openings, circular in form, are made through whichcylinders 31 are passed, the same at their lower ends resting on plates33 located on the bottom 29 on which plates locating ribs 33 are formedto project upwardly into the cylinders as shown, the cylinders at theirlower ends being formed with outwardly extending flanges 34 to make abase for supporting the cylinders. In the construction shown, there arefour of the cylinders 31,

though this number may be varied and.

other, and two of the sides of the drag, in

which at proper positions to come over the upper ends of the cylinders31, rings 36 are positioned with a plurality of radiating arms 37therein connected at their outer ends to the rings and extendinginwardly to a common -center. The grating attached detachably to thelower end of the sand hopper 19 comprises an outer frame 25" withcorresponding parallel bars 35, rings 36 and radiating arms 37 to comedirectly over the corresponding parts of the grating in the drag. Whenthe sand is forced by compressed air pressure through the gratings ntothe drag, it fills the drag and the cylinders 31 and when the drag andbox underneath are removed from the hopper and the'drag disconnectedfrom the box under the same, the mold 38 in the drag has cores 39projecting therefrom, the same extending upwardly when the drag isturned over into the position shown in Fig. 8 to form the lower part ofthe mold. ji'he grating in this case, though of diiferent form from thatshown in Figs. 1 and 3, serves identically the same purposes and has thesame functions.

In filling the cope of the flask, no grating is used therein. In Fig. 6,the cope includes an outer frame 40 having cars 41 projectin from thelower end and being forms with an inwardly extending tapered interiorflange 42 around the same at its lower edges. This cope has a board 43detachably secured thereto at its lower end by pins 9 and wedge blocks12, as shown, cylinders 44 extending upwardly through suitable openingsin the board 43 into the cope, said cylinders being secured to a secondboard 45 under the board 43. The sand forced through the grating at thelower end of the hopper 19 fills the cope and around the cylinders andwhen the cope is taken from the boards 43 and 45 and the cylinders 44,its mold.

46 has openings therein, indicated at 47 sufficiently large to pass overthe cores 39 of the drag portion of the mold previously made and leavespaces around said cores for the entrance of the molten metal. Theflange 42 holds the sand of the cope from fallin out as it is taken fromthe bottom boar and placed on the drag. This is for the casting of potcastings for the production of piston rings, but in every case, the co efrom the fact that it does not have to inverted and does not support thesand weight therein or that of the metal entered into the mold, does nothave to be supplied with a grating as does the drag.

I have shown two variations in structure of the gratings, but it must beobvious that many other specific forms of gratin s may be used withdifferent forms of wor to be roduced. The functions which the same ulfilwhen attached to the lower end of the hopper, or to the under side ofthe drag, coming to the upper side when inverted for filling, are thesame in any case. The construction is very practical in all respects andserves the purposes for which designed perfectly. The appended claimsdefine the invention and I consider myself entitled to all forms ofconstruction coming within their scope.

I claim:

1. In combination, a sand containing ho per having a grating locatedacross t e lower end thereof, said grating including a plurality of barsspaced apart with spaces between the same for the passageof sandtherethrough, but close enough together to normally hold the sand fromescape, and a flask part located directly under the sand hopper having asimilar grating at its upper side when in operative position under thehopper, said grating having like bars located directly under the bars ofthe "rating in the hopper, substantiall as descrlbed.

2. In combination, a san containing ho per having a grating locatedacross t e -sand from escape, said bars of t e per lower end thereof,said grating including a plurality of bars spaced apart, the spacesbetween the same being for the passage of sand therethrough, said barsbeing located close enough together to normall hold the ating beingwider at the bottom than at t e top, and a flask part located directlyunder the sand hopper having a like grating at its upper side when inoperative position under the hopper, said grating being comprised oflike bars located directly under the bars of the grating of the hopperbut wider at their upper than at their lower sides, substantially asdescribed.

3. A sand hopper comprising at its upper and lower ends, and a gratinglocated across the lower end of the hopper including a plurality of barsspaced .apart whereby relativel elongated and narrow openings are ma ebetween the bars, the spaces between the bars being for the passage ofsand from the hopper, said bars being located close enough together tonormally hold the sand in the hopper.

4. A construction containing the elements in combination defined inclaim 3, said grating bars being trapezoidal in cross section and widerat the lower than at the upper sides.

5. A sand ho per comprising an open vertical shell, and a grating formedof narrow bars wider at their lower sides than at their upper sideslocated across the lower end of the shell, substantially as described.

6. A sand hopper comprising a shell open at its upper and lower ends,and a grating located across the lower end of the hop said gratingincluding a plurality of radial bars and concentric rings cast integralwith each other.

7. In combination, a sand containing ho having a grating located across0 lower end thereof for the normal retention of sand but allowin thepassage of sand therethrough on app ication of pressure to the sand inthe hopper, and a flask part located directly under the sand hopper havia like grating at its upper side and form e g withl arts which'arelocated directly under the i end of the hopper, scribed.

.In testimony whereof I aflix my signature.

DONALD J. CAMPBELL.

a shell open substantially as dee parts of the grating in the lower-

